noun
Ornithological term for the distance between the tips of a bird's fully extended wings.
このワシの翼開長は2メートルを超える。
This eagle's wingspan exceeds two meters.
Standard kanji form for wingspan in ornithology.
Alternate kanji form; less common than 翼開長.
翼幅 is a more general term for wingspan, used for both birds and aircraft. 翼開長 is specifically for birds.
Compound of 翼 (wing), 開 (open), and 長 (length). The exact historical derivation is uncertain, but the term is used in modern ornithology.